That is correct. There is a study somewhere that worked out that humans have a level of risk they are comfortable with and when other factors are reduced they simply take extra risks instead. For example, crossing the street; how many people here always wait for the green sign and cross at crossing? Yet the risk/benefit tradeoff is minimal. Similarly, people in safer cars drive faster. If you don't think that's correct how would you drive if you were certain the car would catch on fire with the slightest bump? Therefore, additional safety features are good, but come with disadvantages built in.

